<template>
    <div :class="{ show: show }" class="header-search">
        <svg-icon class-name="search-icon" icon-class="search" @click.stop="click" />
        <el-select
            ref="headerSearchSelectRef"
            v-model="search"
            :remote-method="querySearch"
            filterable
            default-first-option
            remote
            placeholder="Search"
            class="header-search-select"
            @change="change"
        >
            <el-option v-for="option in options" :key="option.item.path" :value="option.item" :label="option.item.title.join(' > ')" />
        </el-select>
    </div>
</template>

<script setup>
import Fuse from "fuse.js";
import { getNormalPath } from "@/utils/baiyu";
import { isHttp } from "@/utils/validate";
import usePermissionStore from "@/store/modules/permission";

const search = ref("");
const options = ref([]);
const searchPool = ref([]);
const show = ref(false);
const fuse = ref(undefined);
const headerSearchSelectRef = ref(null);
const router = useRouter();
const routes = computed(() => usePermissionStore().routes);

function click() {
    show.value = !show.value;
    if (show.value) {
        headerSearchSelectRef.value && headerSearchSelectRef.value.focus();
    }
}
function close() {
    headerSearchSelectRef.value && headerSearchSelectRef.value.blur();
    options.value = [];
    show.value = false;
}
function change(val) {
    const path = val.path;
    const query = val.query;
    if (isHttp(path)) {
        // http(s):// 路径新窗口打开
        const pindex = path.indexOf("http");
        window.open(path.substr(pindex, path.length), "_blank");
    } else {
        if (query) {
            router.push({ path: path, query: JSON.parse(query) });
        } else {
            router.push(path);
        }
    }

    search.value = "";
    options.value = [];
    nextTick(() => {
        show.value = false;
    });
}
function initFuse(list) {
    fuse.value = new Fuse(list, {
        shouldSort: true,
        threshold: 0.4,
        location: 0,
        distance: 100,
        minMatchCharLength: 1,
        keys: [
            {
                name: "title",
                weight: 0.7,
            },
            {
                name: "path",
                weight: 0.3,
            },
        ],
    });
}
// Filter out the routes that can be displayed in the sidebar
// And generate the internationalized title
function generateRoutes(routes, basePath = "", prefixTitle = []) {
    let res = [];

    for (const r of routes) {
        // skip hidden router
        if (r.hidden) {
            continue;
        }
        const p = r.path.length > 0 && r.path[0] === "/" ? r.path : "/" + r.path;
        const data = {
            path: !isHttp(r.path) ? getNormalPath(basePath + p) : r.path,
            title: [...prefixTitle],
        };

        if (r.meta && r.meta.title) {
            data.title = [...data.title, r.meta.title];

            if (r.redirect !== "noRedirect") {
                // only push the routes with title
                // special case: need to exclude parent router without redirect
                res.push(data);
            }
        }
        if (r.query) {
            data.query = r.query;
        }

        // recursive child routes
        if (r.children) {
            const tempRoutes = generateRoutes(r.children, data.path, data.title);
            if (tempRoutes.length >= 1) {
                res = [...res, ...tempRoutes];
            }
        }
    }
    return res;
}
function querySearch(query) {
    if (query !== "") {
        options.value = fuse.value.search(query);
    } else {
        options.value = [];
    }
}

onMounted(() => {
    searchPool.value = generateRoutes(routes.value);
});

watchEffect(() => {
    searchPool.value = generateRoutes(routes.value);
});

watch(show, (value) => {
    if (value) {
        document.body.addEventListener("click", close);
    } else {
        document.body.removeEventListener("click", close);
    }
});

watch(searchPool, (list) => {
    initFuse(list);
});
</script>

<style lang="scss" scoped>
.header-search {
    font-size: 0 !important;

    .search-icon {
        cursor: pointer;
        font-size: 18px;
        vertical-align: middle;
    }

    .header-search-select {
        font-size: 18px;
        transition: width 0.2s;
        width: 0;
        overflow: hidden;
        background: transparent;
        border-radius: 0;
        display: inline-block;
        vertical-align: middle;

        :deep(.el-input__inner) {
            border-radius: 0;
            border: 0;
            padding-left: 0;
            padding-right: 0;
            box-shadow: none !important;
            border-bottom: 1px solid #d9d9d9;
            vertical-align: middle;
        }
    }

    &.show {
        .header-search-select {
            width: 210px;
            margin-left: 10px;
        }
    }
}
</style>
